Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 98: | \[{18^{98}-1\over17}\] | 19 × 449 × 883 × 29009 × 80207 × 101921 × 170227 × 32222107 × 32401295018849<14> × 86651455669280587<17> × 139362986236635048339131<24> × 15944803462923633762605952120076033<35> |